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spcialeffects
Joined: 29 Aug 2012
Posts: 306
Location: Kent
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 Posted: Wed Aug 29, 2012 10:35 am Post subject: Vacuum Bagging |
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Hi all, just about to start building my chock but have been looking at vacuum bagging when building the foam surfaces and just wanted to get peoples views and experiences thanks
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kjburns(at)btinternet.com
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| Posted: Wed Aug 29, 2012 4:45 pm Post subject: Vacuum Bagging |
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Hi,
You will need to peel ply your part avoiding wrinkles and crinkles /folds, as they will leave marks, followed by a wading / wick layer,that soaks up the excess resin that will be squeezed out , the timing of the vacuum will contribute to the amount of resin that is squeezed out of the lay-up if you suck too soon you will have a dry weakened joint. also lighter if that is your goal.
The bag has to be carefully designed /constructed carefully to conform to the shape of the item.
Your complex bag with taped joints will be difficult to seal on any wrinkles and creases,
The vacuum hose connection point needs to be clear of the part you are making as it will leave a mark in the finished piece.
Check your hose and fittings before your next job.. its impossible to get a vacuum if its blocked with resin off your last job!
If you are not supported fully with your mould it will distort under 15 LB a square inch pressure,leaving low spots.
The vacuum process is essential when forming repair sections as it is the best method that will produce consistent adhesion within the varius layers of glass and foam with high strength /less weight.
The applications you are suggesting are tricky but nothing is impossible, if you work backwards from the the finished article, and have loads of time, are very lucky and have many talents and are gifted (or have a good mentor)!
There a a few cheeky ways of getting perfect results from poor surfaced moulds but that is for another day!
That's all there is to it (up till now )!
oh yes if you vacuum on to a mould,spread your release wax to a point well clear of the mould area on to your backing piece or expect to use your angle grinder to cut it free .
Regards
Kevin
From: spcialeffects <spcialeffects(at)aol.com>
To: europa-list(at)matronics.com
Sent: Wednesday, 29 August 2012, 19:35
Subject: Europa-List: Vacuum Bagging
--> Europa-List message posted by: "spcialeffects" <spcialeffects(at)aol.com (spcialeffects(at)aol.com)>
Hi all, just about to start building my chock but have been looking at vacuum bagging when building the foam surfaces and just wanted to get peoples views and experiences thanks
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